/Engine/Source/Runtime/CoreUObject/Public/UObject/LinkerSave.h
Invoke all of the callbacks in PostSaveCallbacks and then empty it.
void OnPostSave ( const [FPackagePath](API\Runtime\CoreUObject\Misc\FPackagePath) & PackagePath, [FObjectPostSaveContext](API\Runtime\CoreUObject\UObject\FObjectPostSaveContext) ObjectSaveContext )